WHEELCHAIR MAINTENANCE AND MINOR REPAIRS

Transcription

1 WHEELCHAIR MAINTENANCE AND MINOR REPAIRS Tools for basic repairs: Hex (Allen) wrenches 5/32 and 3/16 and 4mm and 5mm most common, but a set will cover all needs Socket wrench ¼ drive or 3/8 drive with 3/8, 7/16, ½, 9/16 sockets or metric as appropriate for your wheelchair Adjustable wrench 10 or 12 Phillips head screwdriver 2 tire levers for pneumatic tires Battery/electric operated tire pump Owner s Manual Emergency Tool kit: Items to carry with you at all times: 1. Spare inner tube (as appropriate) 2. Hex (Allen) wrenches 5/32 and 3/16 or 4mm and 5mm (as appropriate) 3. Small adjustable wrench 4. Compact bicycle hand pump or air cartridge Manual Wheelchair Maintenance: Weekly: Wipe down your chair Check tire pressure 1

2 Check the wheel locks Check for loose spokes (if applicable) Check wheelchair cushion for bottoming out Monthly: Clean your cushion and cover Clean and wax your frame Check for loose nuts and bolts Clean and inspect casters Backrests o Solid backrest: check that brackets are properly positioned and secure o Adjustable sling back: check tension Check footrest or footplate for proper positioning Check the bolt which attaches the handrim to the wheel Check the lumbar supports and other inserts for proper positioning Check wheel alignment Inspect chair frame for cracks Clean and check axle on large wheel Wheel locks If the wheel locks are not holding the tire, first check to see if the tire is properly inflated. If this is not an issue, next check the bolts for any excessive play. If there is side to side play, tighten each bolt that is loose until there is only minimal play. Do not over tighten, for this will make the wheel locks very difficult to engage. If this does not solve the problem, next loosen the two bolts on the wheel lock clamp that connects the wheel lock to the frame. Once loose, the wheel lock assembly should be moved to the proper position and the bolts retightened. As you tighten, alternate between the bolts, so the clamp is symmetrically tightened. If any part of the mechanism is bent or the bolts/nuts do not tighten, then the wheel lock needs to be replaced. 2

3 Be sure to use the proper size hex wrench. If the wrench fits, but not exactly, you may need a metric hex wrench or vice versa. Be sure to use a proper fitting wrench, otherwise there is a high probability that you will strip the bolt. Once stripped, the bolt will need to be drilled out in order to remove it. This often requires the expertise of a profession wheelchair repair technician. Pneumatic tires At least weekly, if not more often, check the pressure in your tires. The proper tire pressure should be indicated directly on the tire. Proper inflation of your tires can make a big difference in how your chair performs. Low tire pressure increases rolling resistance, which increases stress on your shoulders and upper extremities, and thereby places you at higher risk for injury. Increased rolling resistance also makes you work harder and fatigue quickly. Replacing a Flat Tire 1. Deflate the tire as much as possible. 2. Insert a tire lever under one edge of the tire above a spoke, push down on the lever until that area of the tire flips off the rim. Secure the hooked end of the tire lever around the corresponding spoke. You may want to hold onto the tire lever close to the end under the tire when applying pressure, as the tire levels are made of plastic and have a tendency to break. 3. Insert the second tire lever a few inches from the first lever. Again push down on the lever until that area of the tire flips over the rim. Then slide this tire lever around the tire in a clockwise direction until one edge of the tire is completely removed from the rim. 4. Remove the tube. 5. Run your finger along both the inside of the tire and along the rim and remove any pieces of glass or any other sharp objects or surfaces which may have damaged the tube. 6. Inflate the new tube until it holds its circular shape. 7. Place the tube in the tire such that the valve stem inserts through the appropriate hole in the rim. 8. Knead (by hand) the tire back onto the rim starting at the valve stem and moving along the rim. You may not be able to get the tire completely back on the rim using only your 3

4 hands. The tire levers can be used to secure the rest of the tire on the rim. 9. Make sure that the valve stem is perpendicular to the rim (i.e. not slanted). Correct if necessary. 10. Re-inflate the tube to the pressure recommended on the tire. Replacing a Tire Tires can either be purchased from your wheelchair vendor or bike shop. Some tires available from the bike shops are black and contain carbon, which can mark up floors and wear out carpet more quickly. However, the back tires will normally last longer and are less expensive to purchase. Bike shops have also now started to carry some more common sizes of carbon free wheelchair tires (gray in color). Alternatively, the bike shop can order either the carbon containing or carbon free tires for you at a fraction of the cost of purchasing them through the wheelchair vendor Where to find tubes and tires Any Medical supply store and most bicycle shops will carry inner tubes and tires or should be able to order them. If you are a regular customer at a bicycle store they may be willing to stock a small supply of the specific tube and tire you need. Spokes Inspect wheels to ensure spokes from the axle to the rim are intact and that they are not bent or loose. Ping Test You can check for proper tightness of the spokes by running a pencil against the each spoke as you spin the wheel and listen to the sound. It should make a melodic pinging sound, which is the normal sound. If any of the spokes vibrate and sound dull then they are loose. Alternatively, you can squeeze two adjacent spokes toward each other for comparative tightness continuing around the wheel until all spokes have been evaluated. For replacement of missing spokes and tightening loose spokes see owners manual. Wipe down chair Wipe down the chair with a clean, damp rag. Any cleaner that is recommended for bicycle frames is appropriate for 4

5 wheelchairs. Avoid cleaners that contain bleach, it may damage the paint. It is best to avoid spraying anything directly on the chair. It is better to spray cleaner on a rag and then wipe down your chair. Even if your chair gets really dirty resist the temptation to spray it down with a hose or power washer as high pressure water can force the grease out of the sealed bearings and cause them to rust. You can use an old toothbrush to remove the dirt from more difficult to clean areas. Casters Clean any debris accumulated in the front casters and check casters for proper stability and play. Remove the caster wheel from the fork and clean out any hair and other debris that have built up. The caster needs to be replaced if: The caster tire is worn. The caster wobbles as it is spun. The caster does not spin freely when free of any resistance such as the floor or hair around the axle. Tracking Tracking is defined as the path the wheelchair takes when coasting. When the chair pulls to the side it is often due to the casters being out of alignment. The vertical alignment may be off, the caster fork may be bent, or there may be more hair wrapped around one axle as compared to the other. Asymmetrical tire pressure, setting of Camber or Center of Gravity adjustment of the rear wheels may also affect the tracking. A bent frame may also cause poor tracking. Unless you take the time to become really familiar with these settings you will be best off to take the chair into the shop for repair of a tracking problem. Back canes Check bolts on adjustable height back canes and tighten as needed. Check bolts on the angle adjustable mechanism and tighten as needed. Backrests Rigid Backs Check to ensure brackets are properly positioned and secure. Most of the rigid backrests utilize brackets to secure the backrests to the wheelchair. Make sure that the bolts to secure the backrests are tight. Also, check to see that the brackets are level when comparing from one side to other. Sometimes, the brackets can loosen and slide up or down on the frame of the chair resulting in one side of the backrest being higher or lower than the other side. This can throw your posture off and cause decreased balance and/or pain. 5

6 Adjustable Sling Back check the tension of the backrest and tighten up the areas that may have stretched out over time. There are usually Velcro straps which can be used to tighten specific areas of the backrest. Pay particular attention to the low back area of the backrest that should be kept tight enough to adequately support the curve in your low back. As the back stretches out it no longer holds your back in a proper sitting position and can throw you balance off and/or cause pain, or even skin problems. Sling seats check the tension of the sling seat. If the middle of the front edge of the seat sling is lower than the seat rails by ½ or more, it is time to be replaced. A slung seat compromises the support needed to provide adequate positioning, especially with ROHO cushions. This can throw the alignment of your pelvis, hips, spine and legs off and cause you pain or skin problems. Loose Nuts and Bolts Tighten any bolts that are loose. Most screws can be tightened up until they are securely tightened. If a bolt or nut is getting severely stripped and it is becoming more difficult to tighten, then it should be replaced. Most nuts and bolts can be purchased at the local hardware store. Be sure to replace the bolt or nut with the exact same type. Some after market backs may have metric bolts and nuts. Some chairs have all metric bolts and nuts. Do not replace a partly solid/partly threaded bolt (called a lag bolt) with an all-threaded bolt (screw). Do not substitute damaged nuts and bolts with those of alternative grades and configurations. There is a number label on the head of the bolt that signifies the strength; the higher the number the stronger the bolt. Only replace bolts with those of the same strength grading. Center of gravity adjustment This adjustment of the rear wheel axle(s) determines how tippy the wheelchair is. The further rearward the center of gravity is the less tippy the chair is. This adjustment is often made with input from your therapist. If you feel that your wheelchair is too tippy or you have difficulty getting the front casters up and over thresholds then you should contact your therapist for adjustment. Cushion Check the cushion for bottoming out. 6

7 ROHO or other air cushions: At least weekly, check to ensure that your ROHO is properly inflated. Place your hand between the deepest bony prominence (normally butt bones or tailbone) and the cushion. There should be ½ or one finger width of air between the deepest bony prominence and the bottom of the cushion. If you are bottoming out the ROHO will need to be re-inflated. If there is more than ½ of air then open the valve and let air out until there is ½ of air between your lowest boney prominence and the bottom of the cushion. Jay cushions check the fluid pad for low spots and foam base for areas of compression. Varilite cushion - To sink into the cushion open the valve, twist to the left, counter clockwise, for a short time then close the valve quickly, twist to the right or clockwise. Check proper depth the same way as the ROHO. To reinflate the cushion, open the valve when not sitting on it. To maintain the cushion open the valve overnight once a week. Remember to close the valve before sitting on the cushion. To adjust the inflation of the cushion, open the valve for a brief period until it is at desired level. Clean cushion and cover ROHO Cover can be machined washed in cold water and air-dried. To clean the cushion, deflate the cushion, close valves and place in large sink. Use a sponge or washcloth to gently scrub air cells and spaces between. ROHO suggests using a liquid dishwashing or laundry detergent or other generalpurpose cleaning liquid. Jay To clean the cover: Remove the cover from the foam base and turn inside out. Machine wash in warm water and drip or tumble dry on low heat. Do not dry clean or use industrial washers and dryers to clean cover. Do not bleach. To clean foam base and positioning components, remove the cover, fluid pad, and PLA reducer ring (if applicable) from the foam base. Wipe lightly with a damp cloth. Do not use soap. Do not submerge in water. Wipe off with a clean cloth. Let it completely air-dry before reassembly. 7

8 Avoid submersion of the foam base in water. To clean fluid pad and fluid inserts, wipe with warm water and soap. Rinse with a clean, damp cloth. Then wipe dry with a clean cloth. Never submerge the fluid pad in any liquid. Avoid harsh cleaning or rough handling as this may lead to a degradation of the fluid insert. From Sunrise Medical Varilite To clean cover remove and machine wash per tag and air dry. To clean cushion, wipe down with a damp cloth. To clean base or wedges use soap and water. Do not saturate. Air dry. Repair ROHO cushion Every ROHO cushion comes with a patch. 1. Place your cushion cells down and over-inflate. 2. Immerse the over-inflated cushion in water to locate the leak. (look for the air bubbles.) 3. Once the leak has been located, mark the leak by inserting a toothpick into the hole. 4. Allow the cushion to dry thoroughly. 5. Clean the area around the hole with the alcohol wipe provided. Let surface dry. 6. Peel backing from patch provided, center the patch and place it over the hole. 7. Press the patch down firmly until a good seal is achieved. 8. Adjust the cushion to proper inflation. Varilite cushion There are patches available from the manufacturer. Power Wheelchair Maintenance: Daily: 8

9 Charge battery every night Check joystick and rubber boot for wear Visually inspect for frayed or exposed wires Weekly: Wipe down chair Check tire pressure as appropriate Check wheelchair cushion for bottoming out Monthly: Clean your cushion and cover Check headrest and footrest for proper positioning Check lumbar support and other inserts for proper positioning Check for loose nuts and bolts Clean and wax your frame Recharging the battery Steps 1. Attach battery charger connector wire to the battery charger. 2. Plug the charger s AC power cord into a ground, 3-prong outlet. If you need to plug the charger into an extension cord, make sure it is an industrial type extension cord with a 3-prong plug, and 15 ampere current rating. 3. Wait until charging is complete as shown on the charger. Usuallly, the light blinks while charging and glows solid when the chair is fully charged. Do: 1. Recharge the battery nightly when the chair is not in use. In general, allow 8 hours for normal recharging. The life of the battery is extended if the charge level is maintained well above a low condition. If the battery is not charged for more than 3 or 4 weeks, there is a high probability that it will no longer take a charge and will need to be replaced. 9

10 Don t: 1. Attempt to recharge the batteries and operate the power chair at the same time. 2. Make it a habit to discharge the battery to the lowest level. 3. Tip or tilt the battery. 4. Attempt to recharge the battery by attaching cables directly to the battery terminal. Always use the authorized battery charger. When to Replace the Battery A battery needs to be replaced when the length of time a battery holds a charge begins to decrease, thereby requiring more frequent charging. A battery will typically last one to two years. Insurance will cover the replacement. Check joystick and rubber boot With the controller turned off make sure that the joystick is not bent or damaged and that it returns to the center when you release it. Check the rubber boot around the base of the joystick for damage. If it is ripped or damaged have it replaced IMMEDIATELY as it leaves the underlying electronics susceptible to moisture. Any water or moisture in the electronic equipment can short out the electronics and cause extensive damage. It is very important to keep it dry. The power chair is designed to withstand some moisture such as going out in the rain for short periods of time. If you need to be out in the rain it is a good idea to secure a couple of plastic bags around the joystick to help prevent excess moisture from getting into the electronic components. Visually inspect for frayed or exposed wires Any frayed or exposed wires should be repaired immediately. An authorized vendor should perform these repairs. If for any reason you need to work on any of the electrical system, make sure that the lead connection to the negative pole of the battery is removed before you begin. If you did not understand the previous sentence then you have no business messing with the electronic system. Motors Listen to your motor. It is a good idea to become familiar with the healthy sound of your wheelchair when it is new. Over time, just like a 10

11 car, it will become a little noisier, but if your ear is tuned to how it sounds when it is healthy, you will be able to notice when there is excessive noise. Increased noise might indicate worn bearings, out of line belts, or frame problems. Some chairs have a motor for each wheel. Each should sound the same. Headrest hardware Check the alignment of the headrest pad. If out of alignment, loosen the bolts on the headrest hardware, re-align the pad, and retighten the bolts. You may have to loosen all the bolts to get enough free movement for the proper alignment. There is usually a small square collar on the post to keep the headrest at the correct height after the headrest has been removed and then re-installed. A general guideline is that the pad is centered at the base of the head. Joystick swing-away mount Check for excessive play and loose bolts/nuts in the linkage. If loose, tighten bolts/nuts, but do not over tighten. If linkage is bent, then it will need to be replaced. Armpads - check for loose screws or bolts on the underside of the armpads. Tighten screws/bolts. If screws are missing or stripped, replace with a bolt/screw of the same thread and length. Footrests or footboards Adjustable angle footplates can become loose and move out of position. If out of alignment, loosen the appropriate bolt, re-align the footplate and then tighten. If the legrest or footrest is bent, then it will need to be replaced. Most footboards have an angle adjustment screw, which can be turned one direction to angle the board up and turned the opposite direction to angle the board down. Check lumbar supports and any other inserts for proper positioning Some lumbar supports as well as other inserts are normally attached with Velcro onto your backrest, usually between the backrest shell and the backrest pad. They have the tendency over time to shift out of place. Simply check to ensure they are properly placed and adjust if necessary. If you don t know where they should be positioned ask your therapist to mark the proper position on the backrest with tape or a marker. Then, in the future, you will know you are readjusting them to the proper position. 11

12 If your wheelchair comes in contact with water Although your power wheelchair is designed to withstand minor water contact, any contact with significant quantities of water should be avoided. Direct exposure to water can cause the electrical components to corrode or short out and the frame to rust. You should not spray your chair with water to clean it and you should not drive your chair through large puddles of water. If you chair comes in contact with water you should: 1. Dry you chair as thoroughly as possible with a towel. 2. Allow the chair to sit in a warm, dry place for 12 hours to allow unseen water to evaporate. 3. Check the joystick operation and brakes before using your wheelchair again. If water gets in the joystick, you may be able to turn the joystick upside down and allow excess water to drain away from the electronic components; then use a hairdryer to dry the area thoroughly. Where do I go if I need other repairs on my chair? Contact your wheelchair vendor to address any other maintenance or repairs which may be necessary or any repairs detailed in this document that you don t understand or feel you can not safely perform. The sooner you obtain repairs the better. The longer a part is loose, the more damage is done and the likelihood of replacement increases with delay. References Websites 1. Koontz, Alicia M and Rory Cooper. SpinTips: Manual Wheelchair Maintenance Karp, Gary. Power Wheelchair Maintenance Tips Rowan, EJ: Wheelchair Preventative Maintenance , Eastern Paralyzed Veterans of America 4. Wheelchair Maintenance Local Vendors NuMotion (As of June 1 st, 2013, Care Medical, United Seating and Mobility, ATG Rehab is now NuMotion) 12

13 American Seating and Mobility Other useful websites: (Quickie, Jay) TiLite Ki Mobility Invacare (Quantum and Jazzy) Permobil Comfort Company Varilite 13